local cmp_status_ok, cmp = pcall(require, "cmp")
if not cmp_status_ok then
  return
end
local snip_status_ok, luasnip = pcall(require, "luasnip")
if not snip_status_ok then
  return
end

require('luasnip.loaders.from_vscode').lazy_load()

local check_backspace = function()
  local col = vim.fn.col "." - 1
  return col == 0 or vim.fn.getline("."):sub(col, col):match "%s"
end

local kind_icons = {
  Text = "",
  Method = "m",
  Function = "",
  Constructor = "",
  Field = "",
  Variable = "",
  Class = "",
  Interface = "",
  Module = "",
  Property = "",
  Unit = "",
  Value = "",
  Enum = "",
  Keyword = "",
  Snippet = "",
  Color = "",
  File = "",
  Reference = "",
  Folder = "",
  EnumMember = "",
  Constant = "",
  Struct = "",
  Event = "",
  Operator = "",
  TypeParameter = "",
}
cmp.setup {
  snippet = {
    expand = function(args)
      luasnip.lsp_expand(args.body)
    end,
  },
  mapping = {
    ["<C-d>"] = cmp.mapping(cmp.mapping.scroll_docs(-1), { "i", "c" }),
    ["<C-f>"] = cmp.mapping(cmp.mapping.scroll_docs(1), { "i", "c" }),
    ["<C-Space>"] = cmp.mapping(cmp.mapping.complete(), { "i", "c" }),
    ["<C-e>"] = cmp.mapping { i = cmp.mapping.abort(), c = cmp.mapping.close() },
    ["<C-y>"] = cmp.config.disable,
    ["<C-k>"] = cmp.mapping.select_prev_item(),
	["<C-j>"] = cmp.mapping.select_next_item(),
    ["<CR>"] = cmp.mapping.confirm { select = true },
    ["<Tab>"] = cmp.mapping(function(fallback)
      if cmp.visible() then cmp.select_next_item()
      elseif luasnip.expandable() then  luasnip.expand()
      elseif luasnip.expand_or_jumpable() then luasnip.expand_or_jump()
      elseif check_backspace() then fallback()
      else fallback()
      end
    end, { "i", "s"}),
    ["<S-Tab>"] = cmp.mapping(function(fallback)
      if cmp.visible() then cmp.select_prev_item()
      elseif luasnip.jumpable(-1) then luasnip.jump(-1)
      else fallback()
      end
    end, { "i", "s"}),
  },
  formatting = {
    fields = { "kind", "abbr", "menu" },
    format = function(entry, vim_item)
      vim_item.kind = string.format("%s", kind_icons[vim_item.kind])
      vim_item.menu = ({
        buffer = "[buf]",
        nvim_lsp = "[lsp]",
        nvim_lua = "[api]",
        luasnip = "[snip]",
        path = "[path]",
      })[entry.source.name]
      return vim_item
    end,
  },
  sources = {
    { name = 'nvim_lsp' },
    { name = 'luasnip' },
    { name = 'path' },
    { name = 'nvim_lua' },
    { name = 'buffer', keyword_length = 3 }
  },
  confirm_opts = {
    behavior = cmp.ConfirmBehavior.Replace,
    select = false,
  },
  documentation = {
    border = { "╭", "─", "╮", "│", "╯", "─", "╰", "│" },
  },
  experimental = {
    ghost_text = false,
    native_menu = false,
  },
}
